CN104578831A - High-power adjustable DC regulated power supply - Google Patents
High-power adjustable DC regulated power supply Download PDFInfo
- Publication number
- CN104578831A CN104578831A CN201310504423.2A CN201310504423A CN104578831A CN 104578831 A CN104578831 A CN 104578831A CN 201310504423 A CN201310504423 A CN 201310504423A CN 104578831 A CN104578831 A CN 104578831A
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- Prior art keywords
- power
- adjustable
- circuit
- current
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a high-power adjustable DC regulated power supply. The high-power adjustable DC regulated power supply comprises 220V AC, an AC step-down transformer, a full-bridge rectifying circuit, a sampling circuit, a sampling signal amplification and current-limiting protection circuit and a voltage dividing circuit and is characterized in that a compensating pipe VT1 in the sampling signal amplification and current-limiting protection circuit is an enhanced N-channel high-power field-effect transistor of 2SK790 model. Before, most compensating pipes in high-power series adjustable regulated power supplies are high-power NPN transistors or PNP transistors, which have the defect of very low power supply conversion efficiency caused by extremely high power loss of the compensating pipes. According to the invention, a high-precision three-end adjustable shunting reference voltage source TL431 is taken as the core, and the enhanced N-channel high-power field-effect transistor serves as the compensating pipe, so that the DC regulated power supply not only can output heavy current and has adjustable output voltage but also greatly improves the power supply conversion efficiency and reliability.
Description
Technical field
The invention belongs to electronics and power technique fields, is about the high-power adjustable D. C regulated of one.
Background technology
High-power adjustable D. C regulated is the power-supply device of design of electronic circuits personnel or electronic leaning laboratory indispensability.The multiplex high-power NPN transistor of Correctional tube in the past in high-power series connection adjustable stabilized voltage supply or high-power PNP transistor, its major defect is that the power loss of Correctional tube is very large, cause the conversion efficiency of power supply very low, be not easy the stabilized voltage power supply making big current.
In order to solve or make up all shortcoming that these high-power adjustable stabilized voltage supplies on the market exist, the high-power adjustable D. C regulated that the present invention uses reference voltage source to make, high accuracy three end adjustable shunt reference voltage source TL431 is adopted to be core, adopt enhancement mode N channel high power field effect transistor as Correctional tube, this D.C. regulated power supply can not only export big current, output voltage is adjustable, and has increased substantially conversion efficiency and the reliability of power supply.
Below describe the relevant technologies content that high-power adjustable D. C regulated of the present invention is involved in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: the multiplex high-power NPN transistor of Correctional tube in the past in high-power series connection adjustable stabilized voltage supply or PNP transistor, its major defect is that the power loss of Correctional tube is very large, cause the efficiency of Power convert very low, be not easy the stabilized voltage power supply making big current.
In order to solve or make up all shortcoming that some high-power adjustable stabilized voltage supply on the market exists, the high-power adjustable D. C regulated that the present invention uses reference voltage source to make, high accuracy three end adjustable shunt reference voltage source TL431 is adopted to be core, adopt enhancement mode N channel high power field effect transistor as Correctional tube, this D.C. regulated power supply can not only export big current, output voltage is adjustable, and has increased substantially conversion efficiency and the reliability of power supply.
Circuit working principle: high-power adjustable D. C regulated passes through 220V alternating current through transformer B step-down, full bridge rectifier QZ, electrochemical capacitor C3 filtering; bleeder circuit is formed by potentiometer RP and resistance R1; sampling amplification circuit is formed by three end adjustable shunt reference voltage source IC1, resistance R3; NPN type triode VT2, sample resistance R2 form current-limiting protection circuit; Correctional tube VT1 is enhancement mode N channel high power field effect transistor; voltage stabilizing output current can reach 6A, and electrochemical capacitor C1 is voltage stabilizing output filter circuit.
Technical scheme: high-power adjustable D. C regulated, it by 220V alternating current, ac buck transformer, full bridge rectifier, sample circuit, sampled signal adjustment is amplified and current-limiting protection circuit, bleeder circuit form, its feature comprises:
Full bridge rectifier: the two ends of AC transformer B secondary coil L2 connect the alternating current input of full-bridge rectification element QZ respectively, the cathode output end of full-bridge rectification element QZ connects the positive pole of electrochemical capacitor C3, the cathode output end of full-bridge rectification element QZ is connected with the negative pole of electrochemical capacitor C3 and circuit ground GND, the two termination 220V alternating currents of AC transformer B primary coil L1;
Sample circuit: be made up of three end adjustable shunt reference voltage source IC1 and resistance R3, the positive pole of the one termination electrochemical capacitor C3 of resistance R3, the negative pole end of another termination three end adjustable shunt reference voltage source IC1 of resistance R3 and the grid of Correctional tube VT1, the positive terminal connection circuit ground GND of three end adjustable shunt reference voltage source IC1;
Sampled signal adjustment is amplified and current-limiting protection circuit: by NPN type triode VT2, current sampling resistor R2 and Correctional tube VT1 forms, Correctional tube VT1 adopts enhancement mode N channel high power field effect transistor, the model selected is 2SK790, the drain electrode of Correctional tube VT1 connects the cathode output end of full-bridge rectification element QZ, the base stage of NPN type triode VT2 connects the source electrode of Correctional tube VT1 and one end of current sampling resistor R2, the collector electrode of NPN type triode VT2 connects the grid of Correctional tube VT1, the emitter of NPN type triode VT2, the other end of current sampling resistor R2 is connected with output end of pressure-stabilizing positive pole VCC,
Bleeder circuit: be made up of potentiometer RP and divider resistance R1, the one termination output end of pressure-stabilizing positive pole VCC of potentiometer RP, the reference edge of one end of another termination divider resistance R1 of potentiometer RP, the positive pole of electrochemical capacitor C2 and three end adjustable shunt reference voltage source IC1, the other end of divider resistance R1 and the negative pole of electrochemical capacitor C2 are connected with circuit ground GND.
Accompanying drawing explanation
Accompanying drawing 1 is the embodiment circuit working schematic diagram that the invention provides a high-power adjustable D. C regulated.
Embodiment
Implement according to the circuit working schematic diagram of high-power adjustable D. C regulated shown in accompanying drawing 1 and the components and parts technical requirement of accompanying drawing explanation and the following stated, can the present invention be realized.
The selection of components and parts and technical parameter
QZ is full-bridge rectification element, requires operating current >=10A, operating voltage >=100V;
IC1 is three end adjustable shunt reference voltage sources, model TL431, packing forms T0-92, and 3 pins are reference edge, positive terminal and negative pole end respectively; Positive pole and negative pole two ends output voltage continuously adjustabe between 2.5 ~ 36V, current margin is 0.1 ~ 100mA;
VT1 is enhancement mode N channel high power field effect transistor, and model is 2SK790, is encapsulated as T0-220;
VT2 is NPN type triode, selects the models such as 2SC9013,3DG8050,3DG12, requires β >=140;
Resistance R1 is RTX-1/4W type metalfilmresistor, and resistance is 470 Ω; The resistance of current sampling resistor R2 is 0.1 Ω, power >=5W; The resistance of resistance R3 is 1.5K Ω, power >=2W;
RP is potentiometer, its resistance 5.6K Ω;
C1 selects the electrochemical capacitor of 470 μ F/40V; C3 selects the electrochemical capacitor of 3300 μ F/50V; C2 selects the electrochemical capacitor of 4.7 μ F/50V.
Circuit production main points and circuit debugging
Power transformer B requires that power >=200W, secondary coil L2 voltage is 35V, requires the operating current >=8A of secondary coil L2;
When making the circuit of high-power adjustable D. C regulated, as long as the electronic devices and components performance selected is intact, and the components and parts annexation welding to specifications in accompanying drawing 1, the physical connection line of circuit and welding quality through carefully check errorless after, circuit only needs simple debugging normally to work;
When circuit debugging, the resistance of current sampling resistor R2 requires that accurately the resistance of current sampling resistor R2 is less than the output current that 0.1 Ω can improve stabilized voltage power supply further, otherwise will reduce output current.
Claims (1)
1. a high-power adjustable D. C regulated, it by 220V alternating current, ac buck transformer, full bridge rectifier, sample circuit, sampled signal adjustment is amplified and current-limiting protection circuit, bleeder circuit form, its feature comprises:
The two ends of the AC transformer B secondary coil L2 in full bridge rectifier connect the alternating current input of full-bridge rectification element QZ respectively, the cathode output end of full-bridge rectification element QZ connects the positive pole of electrochemical capacitor C3, the cathode output end of full-bridge rectification element QZ is connected with the negative pole of electrochemical capacitor C3 and circuit ground GND, the two termination 220V alternating currents of AC transformer B primary coil L1;
Sample circuit is made up of three end adjustable shunt reference voltage source IC1 and resistance R3, the positive pole of the one termination electrochemical capacitor C3 of resistance R3, the negative pole end of another termination three end adjustable shunt reference voltage source IC1 of resistance R3 and the grid of Correctional tube VT1, the positive terminal connection circuit ground GND of three end adjustable shunt reference voltage source IC1;
Sampled signal adjustment amplification and current-limiting protection circuit are by NPN type triode VT2, current sampling resistor R2 and Correctional tube VT1 forms, Correctional tube VT1 adopts enhancement mode N channel high power field effect transistor, the model selected is 2SK790, the drain electrode of Correctional tube VT1 connects the cathode output end of full-bridge rectification element QZ, the base stage of NPN type triode VT2 connects the source electrode of Correctional tube VT1 and one end of current sampling resistor R2, the collector electrode of NPN type triode VT2 connects the grid of Correctional tube VT1, the emitter of NPN type triode VT2, the other end of current sampling resistor R2 is connected with output end of pressure-stabilizing positive pole VCC,
Bleeder circuit is made up of potentiometer RP and divider resistance R1, the one termination output end of pressure-stabilizing positive pole VCC of potentiometer RP, the reference edge of one end of another termination divider resistance R1 of potentiometer RP, the positive pole of electrochemical capacitor C2 and three end adjustable shunt reference voltage source IC1, the other end of divider resistance R1 and the negative pole of electrochemical capacitor C2 are connected with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310504423.2A CN104578831A (en) | 2013-10-23 | 2013-10-23 | High-power adjustable DC regulated power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310504423.2A CN104578831A (en) | 2013-10-23 | 2013-10-23 | High-power adjustable DC regulated power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104578831A true CN104578831A (en) | 2015-04-29 |
Family
ID=53094213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310504423.2A Pending CN104578831A (en) | 2013-10-23 | 2013-10-23 | High-power adjustable DC regulated power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104578831A (en) |
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2013
- 2013-10-23 CN CN201310504423.2A patent/CN104578831A/en active Pending
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |